Boiler-furnace



(No Model.) 2 Sheets-Sheet 1A fr. H. SEARS. BOILER FURNAGE.

N0. 597,027. Patented Jan. 11,1898.

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(No Model.) 2 Sheets-Sheet 2.

TyH. SEARS.

BOILBR PURNAGE.

No. 597,027. Patented Jan. 11,1898.

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BOlLER-FURNACE.

SPECIFICATION forming part of Letters Patent No. 597,027, dated January11, 1898.

Application filed May 27,1896. Serial No. 593,264. (No model.)

' .To all whom t may concern.-

Be it known that LTHoMns H. SnARs, a citizen of the United States ofAmerica, residing in Holyoke, in the county of Hampden and State ofMassachusetts, have invented new and useful Improvements inBoiler-Furnaces and Boilers, of which the following is a specification,reference being had to the accompanying drawings, and letters ofreference marked thereon.

My invention relates to an improved construction of furn ace and boilerwherein all the heat of the furnace is utilized to the best advantageand an improved construction of furnace construction is provided.

The object of my invention is to provide a construction of furnace andboiler wherein any sort of fuel may be employed and wherein asupplementary heating-shell is provided to the end that fuel may beeconomically employed and no part of the heat be carried away by theproducts of combustion, and wherein the construction of the furnace issuch that a truss top is provided and the life of the furnace isincreased; and I accomplish the objects of my invention by theconstruction herein shown.

In the accompanying drawings, in which like letters of referenceindicate like parts, Figure l is a plan view of my improvedconstruction. Fig. 2 is a side elevation in section of the same, andFig. 3 is an enlarged sectional view illustrating a portion of thedetail of construction.

In detail, a indicates the hre-box or combustion-chamber; l),furnace-wall; c, gratebars; d, a Water box or shell; e, bolts; j, mainboiler; g, conduit extending from the steamspace in the main boiler tothe water box or shell d; z., conduit extending from the waterspace inthe main boiler to the Water box or shell d; t', opening throughwater-box; j, cover for the saine; 7c, tubes through which the bolts cpass, and l openings in said tubes.

While the lire-box, grate-bars, and other well-known parts of thefurnace and boiler Y equipment may be of the common construction, Iprefer in my device to use and employ the construction illustrated inthe drawings.

For the purpose of economically utilizing all the heat from the furnaceI arrange directly from the heat I provide the tubular pieces withopenings Z at both top and bottom, so that there will be a constantcirculation of water between the surface of the bolts and the innerwalls of the tubes.

A conduit h is provided opening at one end into the water-space in themain boiler and 'at the opposite end opening into the shell d throughthe top plate, and also a conduit g, connected at one end with thesteam-space in the main boiler and at the other end opening through thetop plate of the shell d at a point somewhat remote from the point ofconnection of the conduit 7L therewith, so that there will beestablished a constant circulation of Water between the boiler andshell. This arrangement of the circulating-pipes g and 7i removes themfrom the direct action of the furnace-heat and conduces to theirpreservation and simplifies and cheapens the construction.

The main boiler is located at the rear of the shell d, so that theescaping products of conibustion will give off its heat in passage, andin this manner substantially all of the heat will be utilized.

It will readily be seen that upon the water in the shell becoming heateda circulation will be at once established between the contents of theshell and the contents of the boiler, and in this mann er I am enabledto heat the Water in the boiler in less time and more economically thanwould be the case if the heat of the furnace were directed against themain boiler only.

A f uel-openin g t is formed vertically through the middle of theWater-box substantially over the center of the fuel-chamber, metal wallsextending about the opening, as shown in the drawings, through whichsawdust and other like fuel (which it is found inconvenient to IOO vro

feed through the furnace-door opening in the end) is fed, and a lid jisprovided to close the opening e'.

It Will be perceived that the tubes 7c serve as spacing-tubes betweenthe opposite plates of the shell d, and being provided with ports oropenings they afford circulation of the Water to and about the bolts andprevent them from becoming overheated by the action of the furnace.

The openings for the circulation of Water Within the tubes k may ofcourse be of any desired shape or size and may consist of a grooveformed in the ends, so that the Water could pass therethrough. Y

Having therefore described my invention,

. what I claim, and desire to secure by Letters Patent, is-

The combination with a furnace and a boiler, of a metal Water-box,comprising a rectangular metal shell d arranged over and coverin g thefuel-chamber of the furnace and having interior Vertical Walls at itscentral portion. to form a rectangular fuel-opening over the middle ofthe fuel-chamber, a door to close the fuel-opening, a plurality ofspacing-tubes formed With circulating-ports7 arranged between the upperand lower plates of the Waterbox, stay-bolts of less diameter than thespacing-tubes passed through the tubes to hold the upper and lowerplates of the Water-box in place, and circulating-pipes g h leading fromthe boiler and opening into the WaterboX through the top plate thereof.

THOMAS H. SEARS. lVitnesses: v

T. W. CRoNIN, A. C. EDsoN.

